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In this activity, learners take their own pulse and explore how heart rate is affected by various activities.

1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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In this experiment, pairs of learners explore how cold water affects circulation. The mammalian diving reflex (MDR) slows circulation when the body is exposed to cold water.

free Ages 8 - 18 30 to 45 minutes